CN103345274A - Method for detecting concentration of hazardous gas - Google Patents
Method for detecting concentration of hazardous gas Download PDFInfo
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- CN103345274A CN103345274A CN2013102686514A CN201310268651A CN103345274A CN 103345274 A CN103345274 A CN 103345274A CN 2013102686514 A CN2013102686514 A CN 2013102686514A CN 201310268651 A CN201310268651 A CN 201310268651A CN 103345274 A CN103345274 A CN 103345274A
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Abstract
The invention provides a method for controlling and detecting the concentration of hazardous gas. The method comprises the steps: a voltage signal or a current signal which is detected by a gas detection instrument is input to an analog input module of a PLC control system; the PLC control system converts a digital signal used for controlling a draught fan into a voltage signal or a current signal through an internal conversion program according to the voltage signal or the current signal; the voltage signal or the current signal is connected to a draught fan device ventilation door regulating valve through an analog output module, and the concentration of the gas is reduced by controlling the opening degree of the ventilation door regulating valve until the concentrate reaches the safe set value. According to the method, data collection, data processing and data display are carried out on the measured concentration of the hazardous gas by executing a monitoring program on an industrial personal computer, the concentration of the hazardous gas is reduced through the linkage of the program and an exhaust device, real-time detection and closed-loop control are carried out on the concentration of the hazardous gas in a production field are achieved, meanwhile, a plurality of concentration pre-alarming values can be set, and safety is further improved.
Description
Technical field
The present invention relates to a kind of toxic and harmful concentration detection method, belong to the toxic and harmful processing technology field.
Background technology
Toxic and harmful concentration detects and control is important step in the garbage comprehensive treatment technology, and rubbish material hole and fermentation plant can produce toxic and harmfuls such as a large amount of sulfuretted hydrogen, methane, ammonia, in case concentration over-standard will cause security incident.Usually the toxic and harmful concentration measuring method is to show numerical value and concentration over-standard is set a gas concentration detector performance installation and by the display screen on the instrument to report to the police.But the problem that this method exists is that meter reading must read at the scene, and be subjected to the restriction of instrument installation site, the warning concentration point has only one, can not link with miscellaneous equipment in the technology, can not form closed-loop control, be not suitable for the application in garbage comprehensive treatment technology.
Summary of the invention
The meter reading that the present invention exists for the toxic and harmful concentration detection technique that solves in the existing garbage comprehensive treatment technology must read at the scene and be subjected to restriction, the warning concentration point of instrument installation site have only one and can not be with miscellaneous equipment interlock in the technology, can not form the problem of the application of closed-loop control, and then provide a kind of toxic and harmful concentration to detect and control method.For this reason, the invention provides following technical scheme:
A kind of toxic and harmful concentration detects and control method, by PLC program and industrial computer remote detection and control the concentration of toxic and harmful, program starts exhaust equipment automatically and reduces concentration after poisonous harmful gas concentration exceeds standard, and until reaching secure setting, may further comprise the steps:
The detected voltage signal of gas control instrument or current signal are input to the analog quantity load module of PLC control system;
Described PLC control system will convert voltage signal or current signal to according to described voltage signal or current signal for the digital quantity signal of blower fan control by internal conversion routine;
Described voltage signal or current signal are connected to Fan Equipment air door variable valve by analog output module, and control air door control valve opening reduces gas concentration, until reaching secure setting.
The present invention is by carrying out watchdog routine at industrial computer, data acquisition, the data of toxic and harmful measurement of concetration are handled and the data demonstration, and by program and exhaust equipment interlock, reduce toxic and harmful concentration, being implemented in the production scene detects and closed-loop control in real time to toxic and harmful concentration, and can set a plurality of concentration pre-alarm values, further improve security.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of instructions, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In Figure of description:
The toxic and harmful concentration that Fig. 1 provides for the specific embodiment of the present invention detects and the schematic flow sheet of control method;
The structural representation that the analog quantity load module that Fig. 2 provides for the specific embodiment of the present invention is connected with field apparatus;
The structural representation that the analog output module that Fig. 3 provides for the specific embodiment of the present invention is connected with field apparatus.
Embodiment
Below in conjunction with the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making all other embodiment that obtain under the creative work prerequisite.
The specific embodiment of the present invention provides a kind of toxic and harmful concentration to detect and control method, by PLC program and industrial computer remote detection and control the concentration of toxic and harmful, program starts exhaust equipment automatically and reduces concentration after poisonous harmful gas concentration exceeds standard, until reaching secure setting, as shown in Figure 1, may further comprise the steps:
Concrete, toxic and harmful mainly comprises sulfuretted hydrogen, methane, ammonia etc., can select corresponding gas control instrument with the characteristics of gas with various, for example in the sulfuretted hydrogen in the content height of sulphur, the ammonia characteristics such as content height of nitrogen determine to use which kind of gas control instrument.
Concrete, as shown in Figure 2, when the voltage signal that detects or current signal are the 4-20mA dc current signal, the gas concentration detector table passes through hardwire, the 4-20mA dc current signal is input to the analog quantity load module of PLC control system, the analog quantity load module is connected by the CPU of backboard with the PLC control system, carries out data transmission.Wherein the 4-20mA dc current signal is represented the concentration value of toxic and harmful.
Concrete, the PLC control system is determined the concentration value of toxic and harmful according to the 4-20mA dc current signal, send the corresponding digital quantity signal that is used for blower fan control, but the control blower fan must use analog signals, therefore also needs to convert digital quantity signal to the 4-20mA dc current signal by the internal processes of PLC control system.
Concrete, as shown in Figure 3, be connected to the air door variable valve of Fan Equipment, control throttle opening, thereby control air quantity size by analog output module.The CPU of PLC control system is connected to switch by industrial network, with upper machine communication, the final gas concentration detector meter reading of realizing can show that host computer is set warning numerical value at host computer, passes through the programming Control alarm response by program automatic control control air draft air quantity.
The technical scheme that adopts this embodiment to provide, by carrying out watchdog routine at industrial computer, data acquisition, the data of toxic and harmful measurement of concetration are handled and the data demonstration, and by program and exhaust equipment interlock, reduce toxic and harmful concentration, be implemented in the production scene toxic and harmful concentration is detected and closed-loop control in real time, and can set a plurality of concentration pre-alarm values, further improve security.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (3)
1. a toxic and harmful concentration detects and control method, by PLC program and industrial computer remote detection and control the concentration of toxic and harmful, program starts exhaust equipment automatically and reduces concentration after poisonous harmful gas concentration exceeds standard, until reaching secure setting, it is characterized in that, may further comprise the steps:
The detected voltage signal of gas control instrument or current signal are input to the analog quantity load module of PLC control system;
Described PLC control system will convert voltage signal or current signal to according to described voltage signal or current signal for the digital quantity signal of blower fan control by internal conversion routine;
Described voltage signal or current signal are connected to Fan Equipment air door variable valve by analog output module, and control air door control valve opening reduces gas concentration, until reaching secure setting.
2. toxic and harmful concentration according to claim 1 detects and control method, it is characterized in that described current signal comprises the 4-20mA dc current signal.
3. toxic and harmful concentration according to claim 1 and 2 detects and control method, it is characterized in that, in that detected voltage signal or current signal also comprise before being input to the analog quantity load module of PLC control system with gas control instrument:
According to the gas type that detects, select predetermined gas control instrument and installation site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102686514A CN103345274A (en) | 2013-06-28 | 2013-06-28 | Method for detecting concentration of hazardous gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102686514A CN103345274A (en) | 2013-06-28 | 2013-06-28 | Method for detecting concentration of hazardous gas |
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| CN103345274A true CN103345274A (en) | 2013-10-09 |
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| CN2013102686514A Pending CN103345274A (en) | 2013-06-28 | 2013-06-28 | Method for detecting concentration of hazardous gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605735A (en) * | 2015-12-31 | 2016-05-25 | 浙江科技学院 | Hydrogen gas automatically-monitoring and actively-protecting device and method |
| CN110515342A (en) * | 2019-08-28 | 2019-11-29 | 吴江天吴特种安全阀有限公司 | A kind of organic concentration on-line monitoring and linkage control system |
| CN113731131A (en) * | 2021-08-26 | 2021-12-03 | 贵阳市环境卫生管理服务中心 | Control method of odor detection and deodorization device for household garbage landfill |
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| WO1991015719A1 (en) * | 1990-04-11 | 1991-10-17 | Transfresh Corporation | Monitor-control systems and methods for monitoring and controlling atmospheres in containers for respiring perishables |
| WO2007135502A1 (en) * | 2006-05-19 | 2007-11-29 | L'air Liquide-Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Systems and methods for reclaiming process fluids in a processing environment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605735A (en) * | 2015-12-31 | 2016-05-25 | 浙江科技学院 | Hydrogen gas automatically-monitoring and actively-protecting device and method |
| CN110515342A (en) * | 2019-08-28 | 2019-11-29 | 吴江天吴特种安全阀有限公司 | A kind of organic concentration on-line monitoring and linkage control system |
| CN113731131A (en) * | 2021-08-26 | 2021-12-03 | 贵阳市环境卫生管理服务中心 | Control method of odor detection and deodorization device for household garbage landfill |
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Application publication date: 20131009 |